The formation of the heart depends on critical signals exchanged between its two main layers: the myocardium (the muscle that powers the heartbeat) and the endocardium (the inner lining of the heart).

Tap the writing field and then press the Globe or Fn key on your keyboard, plus E, to access the Emoji & Symbols palette. Now, use the search bar to quickly search for the white heart emoji.

An Australian man with heart failure has become the first person in the world to survive more than 100 days with an artificial titanium heart as he waited to receive a donor transplant.